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10-02-2014, 05:17 PM | #1 |
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z4 M coupe vs Z4 3.0 and 3.0si
Hello Zpost,
I am hoping some of you can help me as I am less educated on your platform. I know the obvious differences between the powerplant in the Z4 Mc and the Z4 3.0si, but can someone educate me on the suspension differences? I want to know if it is shocks, springs, bushings, control arm differences etc. I am considering a new project and am looking into potentially dropping an S85 into a Z coupe and want to know if buying an M warrants the price difference between a non M as the motor will be pulled. |
10-02-2014, 06:41 PM | #2 |
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3.0 and 3.0si are pretty much same as e46 non-m. 3.0si front brakes are e46 330i, rear brakes are e46 325/328
M is e36 m3 front, e46 m3 rear i think... |
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10-02-2014, 06:47 PM | #3 | |
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10-02-2014, 08:12 PM | #4 | |
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10-03-2014, 10:49 AM | #5 |
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Garage List F15 X5 xDrive35i [8.75]
E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.20] |
Yes, Z4M control arms I believe are E46 330ZHP based which gives more caster. The bushings are also offset and not centered like the non-M Z4 (which share same control arms & bushings as E46 325/328).
I know my statement regarding bushings are correct, control arms not entirely certain. I would check realoem. |
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10-03-2014, 11:26 AM | #6 | |
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10-03-2014, 12:19 PM | #7 |
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10-03-2014, 12:27 PM | #8 |
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Front control arms are the same. Both the non-M and M Z4s come with ZHP control arms. The M has offset bushings similar to E30 M3s.
It's quite the frankenstein's monster.
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10-03-2014, 12:35 PM | #9 | |
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Thank you for the info |
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10-03-2014, 01:01 PM | #10 | |
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10-03-2014, 01:43 PM | #11 |
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Also FWIW even though the M suspension is compatible with E36 M3 struts, I think the shaft length is actually different so if you want a true Z4M application, using off the shelf E36 M3 parts isn't your best option.
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10-03-2014, 03:33 PM | #12 | |
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However, the fronts are E36 type that are about 1" shorter, which is where you throw the monkey wrench into the situation Brakes are also E46M ZCP brakes. Free Floating rotors. Also the M Variable diff will get you started, unless you want to replace it instantly. |
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10-03-2014, 05:52 PM | #13 | |
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10-03-2014, 07:17 PM | #14 | ||
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10-05-2014, 11:54 AM | #15 |
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E36 and E46 rear suspensions are similar enough that the shocks uses the same bolt-up points. For adjustable shocks, cars with E46 M rear end can use E36 M rear end suspension parts like shocks, and springs are the same inner diameter so customized springs can also work between E36 and E46 rears.
However stock components are not interchangeable because the springs are of different rate and length, and shocks aren't tuned to the other chassis' rates, obviously.
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